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MCQOPTIONS
This section includes 96 Mcqs, each offering curated multiple-choice questions to sharpen your Concrete Structures knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
A column of size 450 mm 600 mm has unsupported length of 3.0 m and is braced against side sway in both directions. According to IS 456: 2000, the minimum eccentricities (in mm) with respect to major and minor principal axes are: |
| A. | 20.0 and 20.0 |
| B. | 26.0 and 21.0 |
| C. | 26.0 and 20.0 |
| D. | 21.0 and 15.0 |
| Answer» B. 26.0 and 21.0 | |
| 52. |
The percentage loss of prestress due to anchorage slip of 3 mm in a concrete beam of length 30 m which is post-tensioned by a tendon with an initial stress of 1200 N/mm |
| A. | 0.0175 |
| B. | 0.175 |
| C. | 1.75 |
| D. | 17.5 |
| Answer» D. 17.5 | |
| 53. |
A rectangular column section of 250 mm 400 mm is reinforced with five steel bars of grade Fe 500, each of 20 mm diameter. Concrete mix is M 30. Axial load on the column section with minimum eccentricity as per IS: 456-2000 using limit state method can be applied up to |
| A. | 1707.37 |
| B. | 1805.30 |
| C. | 1806.40 |
| D. | 1903.7 |
| Answer» B. 1805.30 | |
| 54. |
In a random sampling procedure for cube strength of concrete, on sample consists of X number of specimens. These specimens are tested at 28 days and average strength of these X specimens is considered as test result of the sample, provided the individual variation in the strength of specimens is not more than Y percent of the average strenght. the value of X and Y as per IS: 456-2000 are |
| A. | 4 and 10 respectively |
| B. | 3 and 10 respectively |
| C. | 4 and 15 respectively |
| D. | 3 and 15 respectively |
| Answer» E. | |
| 55. |
A pre-tensioned concrete member of section 200 mm 250 mm contains tendons of area 500 mm |
| A. | 11 |
| B. | 9 |
| C. | 7 |
| D. | 5 |
| Answer» C. 7 | |
| 56. |
A reinforced concrete column contains longitudinal steel equal to 1 per cent of net cross-sectional area of the column. Assume modular ration as 10. The loads carried (using the elastic theory) by the longitudinal steel and the net area of concrete, are P |
| A. | 0.1 |
| B. | 1 |
| C. | 1.1 |
| D. | 10 |
| Answer» E. | |
| 57. |
A rectangular beam of width (b) 230 mm and effective depth (d) 450 mm is reinforced with four bars of 12 mm diameter. The grade of concrete is M20 and grade of steel is Fe500. Given that for M20 grade of concrete the ultimate shear strength, |
| A. | 8 |
| B. | 10 |
| C. | 12 |
| D. | 16 |
| Answer» B. 10 | |
| 58. |
The state of two dimensional stress acting on a concrete lamina consists of a direct tensile stress, |
| A. | 1.5 |
| B. | 2.08 |
| C. | 2.17 |
| D. | 2.29 |
| Answer» D. 2.29 | |
| 59. |
The ultimate moment capacity (in kNm) of the section, as per the Limit State Method of IS 456: 2000 is |
| A. | 475.2 |
| B. | 717.0 |
| C. | 756.4 |
| D. | 762.5 |
| Answer» C. 756.4 | |
| 60. |
The value of x |
| A. | 200.0 |
| B. | 223.3 |
| C. | 236.3 |
| D. | 273.6 |
| Answer» D. 273.6 | |
| 61. |
A rectangular concrete beam of width 120 mm and depth 200 mm is pre-stressed by pre-tensioning to a force of 150 kN at an eccentricity of 20 mm. The cross sectional area of the prestressing steel is 187.5 mm |
| A. | 8.75 |
| B. | 6.125 |
| C. | 4.81 |
| D. | 2.19 |
| Answer» C. 4.81 | |
| 62. |
For limit state of collapse, the partial safety factors recommended by IS 456: 2000 for estimating the design strength of concrete and reinforcing steel are respectively |
| A. | 1.15 and 1.5 |
| B. | 1.0 and 1.0 |
| C. | 1.5 and 1.15 |
| D. | 1.5 and 1.0 |
| Answer» D. 1.5 and 1.0 | |
| 63. |
The flexural strength of M 30 concrete as per IS: 456-2000 is |
| A. | 3.83 MPa |
| B. | 5.47 MPa |
| C. | 21.23 MPa |
| D. | 30.0 MPa |
| Answer» B. 5.47 MPa | |
| 64. |
The flexural tensile strength of M25 grade of concrete, in N/mm |
| A. | 0.24 |
| B. | 0.214 |
| C. | 0.35 |
| D. | 5 |
| Answer» D. 5 | |
| 65. |
Maximum possible value of Compacting Factor for fresh (green) concrete is: |
| A. | 0.5 |
| B. | 1.0 |
| C. | 1.5 |
| D. | 2.0 |
| Answer» B. 1.0 | |
| 66. |
The moment of resistance of the section is |
| A. | 206.00 kN m |
| B. | 209.20 kN m |
| C. | 236.80 kN m |
| D. | 251.90 kN m |
| Answer» C. 236.80 kN m | |
| 67. |
The limiting area of tension steel in mm |
| A. | 473.9 |
| B. | 412.3 |
| C. | 373.9 |
| D. | 312.3 |
| Answer» B. 412.3 | |
| 68. |
The depth of neutral axis is |
| A. | 205.30 mm |
| B. | 184.56 mm |
| C. | 160.91 mm |
| D. | 145.30 mm |
| Answer» D. 145.30 mm | |
| 69. |
The depth of neutral axis from the compression fibre is |
| A. | 76 mm |
| B. | 81 mm |
| C. | 87 mm |
| D. | 100 mm |
| Answer» B. 81 mm | |
| 70. |
As per IS 456:2000 for M20 grade concrete and plain barsin tension the design bond stress |
| A. | 46.875 |
| B. | 56.875 |
| C. | 46.975 |
| D. | 46.85 |
| Answer» B. 56.875 | |
| 71. |
A rectangular concrete beam 250 mm wide and 600 mm deep is pre-stressed by means of 16 high tensile wires, each of 7 mm diameter, located at 200 mm from the bottom face of the beam at a given section. If the effective pre-stress in the wires is 700 MPa, what is the maximum sagging bending moment (in kNm) (correct to 1-decimal place) due to live load that this section of the beam can with stand with out causing tensile stress at the bottom face of the beam? Neglect the effect of dead load of beam. |
| A. | 92.2 |
| B. | 88 |
| C. | 86 |
| D. | 86.205 |
| Answer» E. | |
| 72. |
The limiting value of the moment of resistance of the beam is kN.m is |
| A. | 0.14 |
| B. | 0.45 |
| C. | 45.08 |
| D. | 156.82 |
| Answer» D. 156.82 | |
| 73. |
The depth of the neutral axis obtained as per IS: 456-2000 differs from the depth of neutral axis obtained in 26 (a) by |
| A. | 15 mm |
| B. | 20 mm |
| C. | 25 mm |
| D. | 32 mm |
| Answer» D. 32 mm | |
| 74. |
Consider the following statements for air-untrained concrete: |
| A. | Both (i) and (ii) are True |
| B. | Both (i) and (ii) are False |
| C. | (i) is True and (ii) is False |
| D. | (i) is False and (ii) is True |
| Answer» B. Both (i) and (ii) are False | |
| 75. |
Work ability of concrete can be measured using slump, compaction factor and Vebe time. Consider the following statements for work ability of concrete: |
| A. | Both (i) and (ii) are True |
| B. | Both (i) and (ii) are False |
| C. | (i) is True and (ii) is False |
| D. | (i) is False and (ii) is True |
| Answer» E. | |
| 76. |
The modulus of elasticity, E = 5000 |
| A. | tangent modulus |
| B. | initial tangent modules |
| C. | secant modulus |
| D. | chord modulus |
| Answer» C. secant modulus | |
| 77. |
For a beam of cross-section, width = 230 mm and effective depth = 500 mm, the number of rebars of 12 mm diameter required to satisfy minimum tension reinforcement requirement specified by IS: 456-2000 (assuming grade of steel reinforcement as Fe500) is _________. |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 78. |
While designing, for a steel column of Fe250 grade, a base plate resting on a concrete pedestal of M20 grade, the bearing strength of concrete (in N/mm |
| A. | 9 |
| B. | 8 |
| C. | 2 |
| D. | 12 |
| Answer» B. 8 | |
| 79. |
In addition, the beam is subjected to a torque whose factored value is 10.90 kNm. The stirrups have to be provided to carry a shear (kN) equal to |
| A. | 50.42 |
| B. | 130.56 |
| C. | 151.67 |
| D. | 200.23 |
| Answer» D. 200.23 | |
| 80. |
The spacing (mm) of 2-legged 8 mm stirrups to be provided is |
| A. | 40 |
| B. | 115 |
| C. | 250 |
| D. | 400 |
| Answer» C. 250 | |
| 81. |
In the limit state design method of concrete structures, the recommended partial material safety factor (gm) for steel according to IS:456-2000 is |
| A. | 1.5 |
| B. | 1.15 |
| C. | 1.00 |
| D. | 0.87 |
| Answer» E. | |
| 82. |
Match the information related to tests on aggregates given in Group-I with that in Group-II |
| A. | P-1, Q-3, R-4, S-2 |
| B. | P-3, Q-1, R-4, S-2 |
| C. | P-4, Q-1, R-3, S-2 |
| D. | P-3, Q-4, R-2, S-1 |
| Answer» C. P-4, Q-1, R-3, S-2 | |
| 83. |
An R.C. shert column, with 300 mm 300 mm square cross section is made of M20 grade concrete and has 1 members, 20 mm diameter longitudinal bars of Fe 415 steel. It is under the action of a concrete axial compressive load. Ignoring the reduction int he area of concrete due to steel bars, the ultimate axial load carrying capacity of the column is |
| A. | 1659 kN |
| B. | 1548 kN |
| C. | 1198 kN |
| D. | 1069 kN |
| Answer» E. | |
| 84. |
For avoiding the limit state of collapse, the safety of R.C. structures is checked for appropriate combinations of dead load (DL), imposed load or live load (IL), wind load (WL) and earthquake load (EL). Which of the following load combinations in NOT considered? |
| A. | 0.9 DL + 1.5 WL |
| B. | 1.5 DL + 1.5 WL |
| C. | 1.5 DL + 1.5 WL + 1.5 EL |
| D. | 1.2 DL + 1.2 IL + 1.2 WL |
| Answer» D. 1.2 DL + 1.2 IL + 1.2 WL | |
| 85. |
A reinforced concrete structure has to be constructed along a sea coast. The minimum grade of concrete to be used as per IS: 456-2000 is |
| A. | M 15 |
| B. | M 20 |
| C. | M 25 |
| D. | M 30 |
| Answer» E. | |
| 86. |
As per the provisions of IS 456-2000, the (short-term) modulus of elasticity of M 25 grade concrete (in N/mm |
| A. | 25000 |
| B. | 28500 |
| C. | 30000 |
| D. | 36000 |
| Answer» B. 28500 | |
| 87. |
According to the concept of Limit State Design as per IS 456:2000, the probability of failure of a structure is __________ |
| A. | 0.097 |
| B. | 0.099 |
| C. | 0.077 |
| D. | 0.057 |
| Answer» B. 0.099 | |
| 88. |
A simply supported reinforced concrete beam of length 10 m sags while undergoing shrinkage. Assuming a uniform curvature of 0.004 m-1 along the span, the maximum deflection (in m) of the beam at mid-span is ____________ |
| A. | 0.0005 |
| B. | 0.0015 |
| C. | 0.0205 |
| D. | 0.0215 |
| Answer» B. 0.0015 | |
| 89. |
The development length of a deformed reinforcement bar can be expressed as (1/k) ( |
| A. | 6.4 |
| B. | 6.9 |
| C. | 6.7 |
| D. | 6.8 |
| Answer» B. 6.9 | |
| 90. |
The composition of an air-entrained concrete is given below: |
| A. | 51 |
| B. | 52 |
| C. | 24 |
| D. | 15 |
| Answer» B. 52 | |
| 91. |
Assuming concrete below the neutral axis to be cracked, the shear stress across the depth of a singly-reinforce rectangular beam section |
| A. | increases parabolic ally to the neutral axis and then drops suddenly to zero value |
| B. | increases parabolic ally to the neutral axis and then remains constant over the remaining depth |
| C. | increases linearly to the neutral axis and then remains constant up to the tension steel |
| D. | increases parabolic ally to the neutral axis and then remains constant up to the tension steel |
| Answer» E. | |
| 92. |
The working stress method of design specifies the value of modular raito, m = 280/(3 |
| A. | No compensation |
| B. | Full compensation |
| C. | Partial comprssion |
| D. | The two are unrelated |
| Answer» D. The two are unrelated | |
| 93. |
The effective length of a column in a reinforced concrete building frame, as per IS: 456-2000, is independent of the |
| A. | frame type i.e., braced (no sway) or un-braced (with sway) |
| B. | span of the beam |
| C. | height of the column |
| D. | loads acting on the frame |
| Answer» E. | |
| 94. |
Read the following two statements |
| A. | Statement I is true but II is false |
| B. | Statement I is false but II is true |
| C. | Both statements I and II are true |
| D. | Both statement I and II are false |
| Answer» D. Both statement I and II are false | |
| 95. |
Identify the FALSE statement from the following, pertaining to the design of concrete structures. |
| A. | The assumption of a linear strain profile in flexure is made use of in working stress design, but not in ultimate limit state design. |
| B. | Torsional reinforcement is not required to be provided at the corners of simply supported rectangular slabs, if the corners are free to lift up. |
| C. | a rectangular slab, whose length exceeds twice its width, always behaves as a two way slab, regardless of the support conditions |
| D. | The load balancing concept can be applied to select the appropriate tendon profile in a prepossessed concrete beam subject to a given pattern of loads. |
| Answer» B. Torsional reinforcement is not required to be provided at the corners of simply supported rectangular slabs, if the corners are free to lift up. | |
| 96. |
The following two statements are made with reference to a simply supported under-reinforced RCC beam: |
| A. | Both the statements are false. |
| B. | I is true but II is false. |
| C. | Both the statements are true. |
| D. | I is false but II is true. |
| Answer» E. | |